Tckit

TcKit (Claude Code plugin)

Connects Claude Code to TwinCAT 3 PLC projects. Read project structure, write Structured Text, trigger builds, deploy to targets, run TcUnit tests.

Install

In Claude Code:

/plugin marketplace add georgeturneruk/tckit
/plugin install tckit@tckit

Then walk through setup:

> Set me up for TcKit.

The bundled tc-config skill drives a guided init: prompts for your AMS Net IDs, safety stance, project paths, writes ~/.tckit/config.toml, runs a smoke test.

Prerequisites

• Claude Code (CLI / IDE extension / desktop app).
• uv — install via pip install uv or your platform's installer. The plugin's MCP server runs as uvx tckit, which fetches the Python package from PyPI on first use.
• TwinCAT 3.1 Build 4026 + TcXaeShell on a Windows host (only required for write/build/deploy/test; read-only operations work without it).
• Bridge service: run tckit bridge install once to copy the bundled Windows bridge to ~/.tckit/bridge/, then start ~/.tckit/bridge/Start-Bridge.ps1 in a separate PowerShell window. tckit doctor will offer to run the install for you the first time. Requires TcXaeShell to be open.

What you get

Six skills that load on demand based on what you ask:

Skill	Loads when
tckit:tc-orient-project	First touch on a TwinCAT project ("what's in this project")
tckit:tc-read-project	Inspecting / navigating a TwinCAT project
tckit:tc-beckhoff-docs	Researching a Beckhoff library FB or function
tckit:tc-write-st	Writing or modifying Structured Text
tckit:tc-build-test-loop	Building, deploying, running TcUnit tests
tckit:tc-config	Configuring TcKit, editing safety stance, switching modes

Plus the underlying MCP server exposing 20 tools (project reader, writer, builder, test runner, doc generator, Beckhoff infosys searcher).

The plugin is stdio-only. Docker mode exists for CI / contributor workflows and isn't a user install path; see the docker-setup docs if you need it.

Documentation

• Project docs: https://tckit.org
• Source: https://github.com/georgeturneruk/tckit
• Issues: https://github.com/georgeturneruk/tckit/issues

Licence

MIT. See LICENSE.